Bryant 502A Manual

Horizontal indoor single package cooling units ceilingpac 2 to 5 tons

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HORIZONTAL INDOOR
SINGLE PACKAGE
COOLING UNITS
Single Package Cooling Units Featuring:
• compact design
• flexibility
• easy maintenance
• high quality and reliability
• quiet and efficient scroll compressor technology

FEATURES/BENEFITS

All in one package — high cooling efficiency, installation con-
venience, ease of accessibility for time-saving maintenance.
SPACE AND COST-SAVING DESIGN — Model 502A is spe-
cifically designed to provide the building owner with behind the
scenes cooling, because it installs inside the ceiling. That's
why we call it the Bryant CeilingPAC unit. The compact design
and low silhouette enable it to fit easily and securely above the
conditioned space. Single package construction makes it easy
to install with minimal time and cost.
APPLICATION FLEXIBILITY — If desired for particular appli-
cations, the unit can also be installed as a split system with the
condenser section mounted horizontally. Centrifugal fans per-
mit ducting of both evaporator and condenser air.
QUIET OPERATION — Commercial end users appreciate the
extra comfort of quiet operation. Bryant engineers met the
challenge by specifying heavy insulation, vibration-resistant
construction and operating components that function at low
noise levels, all of which keep system sound at a minimum
level.
EASY MAINTENANCE — When it comes to maintenance, the
502A unit rates high in accessibility. Indoor location is ideal for
the maintenance technician, and five access panels, easily
removed, provide quick and convenient access to all compo-
nents when needed. As an added plus, all required service/
maintenance access can be from one side allowing the unit to
be located against a wall or ceiling plenum obstruction, an
obvious space-saving idea.
BRYANT QUALITY AND RELIABILITY — The Bryant 502A
CeilingPAC units have much to offer the cost- and efficiency-
conscious commercial owner. Every unit is thoroughly run
tested at the factory and equipped with safety controls
designed to monitor and protect over the life of the unit.
SCROLL COMPRESSOR TECHNOLOGY — Scroll compres-
sors are designed for high efficiency and are internally spring
mounted to minimize vibration noise. Each compressor is
hermetically sealed against contamination to promote longer
life and dependable operation. Scroll compressors are
standard on all units.
Model 502A
CeilingPAC
2 to 5 Tons
Form No. PDS 502A.24.1

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Summary of Contents for Bryant 502A

  • Page 1: Features/Benefits

    That’s CeilingPAC units have much to offer the cost- and efficiency- why we call it the Bryant CeilingPAC unit. The compact design conscious commercial owner. Every unit is thoroughly run and low silhouette enable it to fit easily and securely above the tested at the factory and equipped with safety controls conditioned space.
  • Page 2: Table Of Contents

    TABLE OF CONTENTS Page Features/Benefits ........1 Model Number Nomenclature .
  • Page 3: Physical Data

    NOTE: If components are to be split, the maximum length of refrigerant tubing to be used is 50 equivalent ft, assuming components will be installed in same horizontal plane. — High-Pressure Switch If components are not to be installed in same horizontal plane, contact your Bryant rep- — Low-Pressure Switch resentative for more information.
  • Page 4: Field-Installed Accessories

    FIELD-INSTALLED ACCESSORIES Thermostat and Subbase — Attractive wall-mounted 24-v Condensate Pump — The condensate pump is used when the accessory provides precise temperature control. Automatic and distance and slope to the nearest drain is far enough to prevent Manual changeover models available. A thermostat subbase is the natural drainage of unit.
  • Page 5: Base Unit Dimensions

    BASE UNIT DIMENSIONS DIMENSIONS (ft-in.) UNIT 502A 1- 5 1- 5 1-11 1-11 Unit Component Locations...
  • Page 6: Selection Procedure

    SELECTION PROCEDURE (with example) 67 F ewb will provide a Total Capacity (TC) of 44,200 Btuh I DETERMINE COOLING REQUIREMENTS AT DESIGN CONDITIONS. and a Sensible Heat Capacity (SHC) of 31,300 Btuh. Since the entering air is 80 F edb, an SHC correction is Given: not required.
  • Page 7: Physical Data

    PERFORMANCE DATA (cont) GROSS COOLING CAPACITIES (cont) 502A048 502A060 Evaporator Air Quantity Cfm/BF Evaporator Air Quantity — Cfm/BF Temp Temp 1200/0.06 1600/0.08 2000/0.10 1500/0.06 2000/0.09 2250/0.10 Air Ent Air Ent Condenser Condenser Evaporator Air Ewb Temp (F) Evaporator Air Ewb Temp (F) 56.0 52.1 47.9 44.4 57.7 54.5 50.6 49.6 59.4 56.0 52.7 52.3 64.8 58.5...
  • Page 8 PERFORMANCE DATA (cont) BELT DRIVE EVAPORATOR FAN PERFORMANCE (Special Order Only, Pricing and ordering on related price pages.) UNIT SIZE — 502A Fan kW Fan kW 1800 — — — — 1850 — — — — 1900 — — — —...
  • Page 9: Controls

    CONTROLS 2. When room thermostat is satisfied, the evaporator fan, com- OPERATING SEQUENCE pressor, and condenser fan shut off. Cooling Continuous Fan Operation — The thermostat can be set for 1. Thermostat calls for cooling. continuous operation by setting the fan switch to ON. a.
  • Page 10: Typical Wiring Schematics

    ELECTRICAL DATA (cont) ELECTRIC HEATER STATIC PRESSURE DROP (in. wg) UNIT CFM ELECTRIC HEATER UNIT UNIT 88EN 502A 1000 1200 1400 1600 1800 2000 2200 0050CA01 — — — — — 024, 036 0075CA01 — — — — — 1-stage 0115CA01 heat 0075EA01...
  • Page 11 TYPICAL WIRING SCHEMATICS (cont) LEGEND — Adjustable Heat Anticipator — Thermostat-Heating NOTES: — Contactor Compressor TRAN — Transformer 1. Neutral for 240/416 v supply (Canada only). — Capacitor 2. If any original wires furnished must be replaced, it should be Marked Wire —...
  • Page 12 TYPICAL WIRING SCHEMATICS (cont) LEGEND NOTES: — Adjustable Heat Anticipator 2. If any original wires furnished must be replaced, it should be Marked Wire — Contactor Compressor replaced with 90 C or its equivalent. — Capacitor 3. Numbers indicate the line location of used contacts. A bracket Denotes connection point between —...
  • Page 13 TYPICAL WIRING SCHEMATICS (cont) LEGEND — Adjustable Heat Anticipator Denotes connection point between NOTES: BKR W/AT — Breaks with Amp Turns subbase and thermostat — Contactor Compressor 1. Compressor and fan motors are thermally protected, three-phase — Cooling Compensator motors protected against primary single-phase conditions. Terminal (Marked) —...
  • Page 14: Typical Piping And Wiring

    TYPICAL PIPING AND WIRING LEGEND NEC — National Electrical Code NOTES: 3. All piping must follow standard refrigerant piping techniques. 1. Wiring and piping shown are not intended for or to include all 4. For other installation details refer to Installation Instructions. details for specific installation.
  • Page 15: Guide Specifications

    * are specified. For assistance in Connections shall be factory plugged for field amending the specifications, your local Bryant Sales removal. Office should be contacted. 5. Field splittable through the removal of 4 bolts and 1.
  • Page 16 Package shall include damper operating device and all necessary hardware. SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE UNIT MUST BE INSTALLED IN ACCORDANCE WITH INSTALLATION INSTRUCTIONS Copyright 2001 Bryant Heating & Cooling Systems Printed in U.S.A. 1-01 Catalog No. 5250-200...

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